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公开(公告)号：DE69829020D1
公开(公告)日：2005-03-24
申请号：DE69829020
申请日：1998-07-02
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , JAQUETTE GLEN ALAN
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公开(公告)号：CA2148390C
公开(公告)日：2004-04-27
申请号：CA2148390
申请日：1995-05-02
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , BARRETT ROBERT CARL , EATON JAMES HOWARD
Abstract: A track following servo system is disclosed for use with magnetic tape syste ms in which magnetic servo track patterns contain transitions recorded at more than on azimuthal orientation across the width of the servo track. The timing of a signal derived from reading at any point across the width of such a pattern varies continuously as the read head is moved across the servo track. The pattern i s read by a servo read head whose width is small compared to the servo track patter n. The combination of a wide servo pattern and a narrow servo read head offers excellent position sensing linearity and dynamic range. In the preferred embodiment, t he servo read head is also narrow with respect to the data tracks, which provid es the additional advantages of superior immunity to position sensing errors caused by defects or temporal variations in the servo read head, defects in the servo pattern on the tape, wear of the head or tape, or debris collection on the head or tape. Position sensing with this system is achieved by deriving a ratio of two ser vo pattern intervals and therefore is insensitive to tape speed during reading. The ser vo patterns may include spacing intervals recognizable for error detection and correction purposes. Servo tracks are recorded using a patterned multiple ga p servo write head whosemagnetic gaps have geometries appropriate to generate the desired servo patterns. The patterned gaps of the servo write head are produced by photolithographically defined electroplating of permalloy on a ferrite ri ng head structure.
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Patent Agency Ranking
公开(公告)号：HU0200722A2
公开(公告)日：2002-07-29
申请号：HU0200722
申请日：2000-04-13
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , KOZLOVSKY WILLIAM JOSEPH , SINGH GURINDER PAL , SUK MIKE
Abstract: A lift tab for a load/unload type of data storage hard drive and a method of smoothing the lift tab. The method includes the step of striking the lift tab with short duration (e.g. 10-500 nanosecond) energy pulses to melt a thin surface layer of the lift tab. The melted layer flows under surface tension forces, smoothing out bumps and scratches. The melted layer quickly refreezes, forming an exceptionally smooth melted and refrozen spot. Preferably, the melted and refrozen spot is 0.2-10 microns deep. More preferably, the melted and refrozen spot is in the range of 1.0 to 3.0 microns thick. The lift tab can have a large number of melted and refrozen spots. The size of the melted and refrozen spots is practically limited by power available from energy sources such as lasers. Preferably, the melted and refrozen spots are at least several tens of microns in diameter. The present invention includes lift tabs having melted and refrozen spots. Also, the present invention includes head gimbal assemblies and hard drives having lift tabs with melted and refrozen spots.
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公开(公告)号：CZ20013692A3
公开(公告)日：2002-05-15
申请号：CZ20013692
申请日：2000-04-13
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , KOZLOVSKY WILLIAM JOSEPH , SINGH GURINDER PAL , SUK MIKE
Abstract: A lift tab for a load/unload type of data storage hard drive and a method of smoothing the lift tab. The method includes the step of striking the lift tab with short duration (e.g. 10-500 nanosecond) energy pulses to melt a thin surface layer of the lift tab. The melted layer flows under surface tension forces, smoothing out bumps and scratches. The melted layer quickly refreezes, forming an exceptionally smooth melted and refrozen spot. Preferably, the melted and refrozen spot is 0.2-10 microns deep. More preferably, the melted and refrozen spot is in the range of 1.0 to 3.0 microns thick. The lift tab can have a large number of melted and refrozen spots. The size of the melted and refrozen spots is practically limited by power available from energy sources such as lasers. Preferably, the melted and refrozen spots are at least several tens of microns in diameter. The present invention includes lift tabs having melted and refrozen spots. Also, the present invention includes head gimbal assemblies and hard drives having lift tabs with melted and refrozen spots.
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公开(公告)号：SG77235A1
公开(公告)日：2000-12-19
申请号：SG1999002230
申请日：1999-05-11
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , SURESH KUMAR , MUTHUTHAMBY SRI-JAYANTHA SRI , DAS KHANNA VIJAYESHWAR
Abstract: A miniature removable disk drive that meets the CompactFlash type II form factor and interface specifications uses a composite sheet metal/plastic tub-shaped base for supporting the disk drive components, e.g., the spindle motor with attached disk, the voice coil motor actuator with attached read/write head, and the preamplifier/write driver electronics module. The composite base is a metal plate with a flange extending around its perimeter and a plastic frame that encapsulates the flange and surrounds the perimeter of the metal plate. The metal plate supports the disk drive spindle motor and voice coil motor actuator and is made of high magnetic permeability, low coercivity material so that it can form part of the magnetic circuit of the spindle motor and/or actuator. The flanges on the metal plate provide rigidity and allow the base to be fabricated by injection molding the plastic frame onto the metal base so that the plastic encapsulates the metal flanges to form the walls of the tub-shaped base. An electronics card is located beneath the metal plate and is electrically shielded from the read/write heads and electronics module by the metal plate. Top and bottom covers are attached to the frame to enclose the disk drive components and the electronics card. Because the frame is made of plastic the corners may be made with intricately shaped cutouts that allow elastomeric corner bumpers to be interlocked into the frame at the corners. The corner bumpers extend beyond the frame and the covers so as to provide shock protection if the miniature removable disk drive is dropped.
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公开(公告)号：DE69507210D1
公开(公告)日：1999-02-25
申请号：DE69507210
申请日：1995-06-16
Applicant: IBM
Inventor： ALBRECHT THOMAS ROBERT , BARRETT ROBERT CARL , EATON JAMES HOWARD
IPC: A63F7/02 , G11B5/265 , G11B5/58 , G11B5/584 , G11B5/596 , G11B21/10 , G11B5/54 , G11B5/55 , G11B5/48
Abstract: A track following servo system is disclosed for use with magnetic recording media 20 in which magnetic servo track 27 patterns contain transitions recorded at more than one azimuthal orientation across the width of the servo track. The timing of a signal derived from reading at any point across the width of such a pattern varies continuously as the read head is moved across the servo track. The pattern is read by a servo read head 26 whose width is small compared to the servo track pattern. The combination of a wide servo pattern and a narrow servo read head offers excellent position sensing linearity and dynamic range. In the preferred embodiment, the servo read head is also narrow with respect to the data tracks, which provides the additional advantages of superior immunity to position sensing errors caused by defects or temporal variations in the servo read head, defects in the servo pattern, wear of the head, or debris collection. Position sensing with this system is achieved by deriving a ratio of two servo pattern intervals and therefore is insensitive to medium speed during reading. The servo patterns may include spacing intervals 70 recognizable for error detection and correction purposes. The servo tracks may be recorded using a patterned multiple gap servo write head 400 whose magnetic gaps have geometries appropriate to generate the desired servo patterns.
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公开(公告)号：SG33347A1
公开(公告)日：1996-10-18
申请号：SG1995000276
申请日：1995-04-18
Applicant: IBM
Inventor： EATON JAMES HOWARD , BARRETT ROBERT CARL , ALBRECHT THOMAS ROBERT
Abstract: A track following servo system is disclosed for use with magnetic recording media 20 in which magnetic servo track 27 patterns contain transitions recorded at more than one azimuthal orientation across the width of the servo track. The timing of a signal derived from reading at any point across the width of such a pattern varies continuously as the read head is moved across the servo track. The pattern is read by a servo read head 26 whose width is small compared to the servo track pattern. The combination of a wide servo pattern and a narrow servo read head offers excellent position sensing linearity and dynamic range. In the preferred embodiment, the servo read head is also narrow with respect to the data tracks, which provides the additional advantages of superior immunity to position sensing errors caused by defects or temporal variations in the servo read head, defects in the servo pattern, wear of the head, or debris collection. Position sensing with this system is achieved by deriving a ratio of two servo pattern intervals and therefore is insensitive to medium speed during reading. The servo patterns may include spacing intervals 70 recognizable for error detection and correction purposes. The servo tracks may be recorded using a patterned multiple gap servo write head 400 whose magnetic gaps have geometries appropriate to generate the desired servo patterns.
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